Mold.



0. H. HOWARD.

MOLD. APPLIOATION FILED MARA, 1910.

996,585, I Patented June27, 1911.

.[Vrzmroka aw d omma CLARENCE H. HOWARD, OF ST. LOUIS, MISSOURI, ASSIGNOR TO COMMONWEALTH STEEL COMPANY, OF ST. LOUIS, MISSOURI, A CORPORATION OF NEW JERSEY.

MOLD.

Specification of Letters Patent.

Patented June 27, 1911.

To all whom it may concern:

Be it known that I, CLARENCE H. HOWARD, a citizen of the United States, residing at St. Louis, in the State of Missouri, have invented a new and useful Improvement in Molds, of which the following is a specification.

My invention relates to a mold for cast ings, which ordinarily comprises a drag or lower flask open at the top and bottom and initially supported at the bottom on a follow-board on which, within the opening of the drag, is placed the pattern of the desired casting, the drag being then filled with sand or suitable molding material which is rammed about the pattern to form a solid mold, and the whole inverted, when the follow-board is removed, the pattern withdrawn from the sand and the cope or upper flask placed on the drag over the matrix of the mold thus formed therein, and clamped to the drag by clamps, bolts, or other devices.

My invention has for its object to dispense with the ordinarily constructed cope and its clamping devices, and to insure a perfect closure of the mold without injury to the matrix thereof.

It consists in features of novelty as hereinafter described, reference being had to the accompanying drawing forming part of this specification, whereon,

Figure 1, is a vertical central longitudinal section through the drag or lower flask of my improved mold, showing the followboard and pattern of the desired casting in their initial position for molding, and the drag filled with sand about the pattern; Fig. 2, a similar view to Fig. 1, showing the drag inverted, the follow-board removed from the top thereof, and the pattern withdrawn from the sand; Fig. 3, a similar view to Fig. 2, showing the matrix or mold formed in the sand by the pattern closed at the top by my improved cover; Fig. 4:, a top plan view to reduced scale of the combined parts of the mold corresponding to Fig. 3, and Fig. 5, an inverted plan of the cover seen in Fig. 4 detached and omitting the sand filling forming part thereof.

Like letters and numerals of reference denote like parts in all the figures.

a represents the drag or lower molding flask consisting of a metallic frame of the usual well-known shape, open at the top and bottom and supported initially on a follow-board b on which the pattern 0 of the desired casting (in the present case that of the center-plate of a car truck bolster) is placed in the proper position for molding, within the bottom opening of the drag a, as seen in Fig. 1, and the latter filled with sand (or other suitable molding material) d which is rammed solidly about the pattern 0 and faced at the top, preferably level with the top of the drag a, the whole being then inverted, the follow-board I) removed from the topof the drag a, and the pattern 0 Withdrawn from the sand (Z, as seen in Figs. 2 and 3.

For closing the top of the matrix 0 formed in the sand (Z by the pattern 0 as above described, I use acover 6 (Figs. 3, 4:, and 5) comprising preferably a metallic plate 1 of suitable configuration and area according to the nature of the desired casting, and of sufficient weight to bear firmly upon the drag a when so placed as hereinafter more particularly referred to. I11 one side of the metallic plate 1 is formed a recess 2 of suit able configuration according to the said cast ing, and having its surrounding walls or surfaces 3 preferably converging from the bottom 4 of the recess 2. By converging or inclining the walls 3 the area of the opening into the recess 2 is necessarily smaller than the area of the bottom 4 of said recess, and for this reason the edges of the body of sand packed into the recess 2 is effectually retained therein. On the bottom 4 and preferably, integral with the plate 1, are formed ribs 5 which are outwardly dove-tailed in cross section from their junction with the bottom 4 and terminate at a distance therefrom, preferably less than the depth of the recess 2 thereat, the ribs 5 preferably intersecting each other at right angles as shown, but may be otherwise arranged as found most desirable. The recess 2 is filled with sand (or other suitable molding material) 6 which is rammed solidly about the surrounding walls 8 and ribs 5 of the recess 2 and outwardly faced flush with the edges of the walls 8 or thereabout, which with the ribs 5 are adapted to firmly hold the sand filling 6 in place within the recess 2 in whatever position the cover 6 is placed.

In operation, the cover 0 is placed over the drag a with its metallic plate 1 uppermost and its sand filling 6 downward so that the latter facially closes the top of the matrix or mold a and simultaneously bears upon and efiects a perfect closure with the sand (Z in the drag a about the mold 0, the weight of the cover 6 being sufficient to retain the close contact of its sand 6 with the sand d against the pressure of the molten metal during its inflow to the mold 0 without the clamps or other devices now used for holding down the ordinary cope.

7 and 8 represent a preferable arrangement of the pouring gates through the molding material in the drag a and cover 6 re spectively, or they may be otherwise arranged as found desirable in practice.

What I claim as my invention and desire to secure by Letters Patent is 1. In a mold for castings, the combination with the drag and its contained molding material having the matrix of the desired casting formed therein of a cover, comprising a metallic plate having a recess in one side the opening into which recess is smaller in area than the bottom thereof, intersecting ribs projecting and dove-tailed outward from, the bottom of the recess, molding material consolidated within the recess about the surrounding walls thereof and the said ribs, and adapted facially to close the top of the said matrix, and to bear thereabout upon the material in which the matrix is formed.

2. In a mold for castings, the combination with the drag and its contained molding material having the matrix of the desired casting formed therein, of a cover, comprising a metallic plate having a recess in one side,

the surrounding Walls of the recess converging from the bottom thereof so that the opening into said recess is smaller in area than the bottom thereof, intersecting ribs projecting and outwardly dove-tailed from the bottom of the recess, molding material consolidated within the recess about the said walls and ribs and adapted facially to close the top of the said matrix and to bear thereabout upon the material in which the matrix is formed.

3. In a mold for castings, a cope plate having a recess formed in one of its faces, the opening into which recess is smaller in area than the bottom of said recess, and a series of ribs on the face of the plate within the recess, which ribs are dove-tailed in cross section, and of a thickness less than the depth of the recess.

4;. In a mold for castings, a cope plate and Walls formed on the marginal edges thereof to form a recess on one side of said plate, the inner faces of which wall-s are inclined, and intersecting ribs formed on the face of the plate within the recess, which ribs are dove-tailed in cross section.

5. In a mold for castings, a cope plate, walls on the marginal edges thereof to form a recess on one side of said plate, and ribs formed on the face of the plate within the recess, which ribs are dove-tailed in cross section.

CLARENCE H. HOWARD.

Witnesses:

HAL C. BELLVILLE, EDWARD W. F URRELL.

Copies of this patent may, be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. C. 

